How do I pass in parameters to the express.js server side routing for a MEAN.js package.

I am a beginner working on a project structured by mean.js. I am still trying to figure out how the whole project struct works and I am a little stuck.

Currently, I have two crud modules. A project module and an application module. Users should be able to apply to projects. Under a certain project, I should be able to view all the applications and then accept/reject them.